>>>>> "Maciej" == Maciej W Rozycki <macro@linux-mips.org> writes:
Maciej> These systems only allow the CPU to access devices other than
Maciej> RAM. But consistency between platforms is important as the
Maciej> same drivers may be used for systems that have different
Maciej> access rules. Examples are currently the defxx and the tgafb
Maciej> drivers. They should work correctly with the R3220 writeback
Maciej> buffer as well as with PCI.
So just change the implementation of mmiowb depending on whether it's
on an R3220 or a PCI system.
Cheers,
Jes